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135a7217b9
mpv/player/video.c
wm4 657dd4b807 video: don't wait for last video frame in the normal case 
Even though the timing logic is correct, it tends to mess with looping
videos and such in unappreciated ways.

It also has to be admitted that most file formats seem not to properly
define the duration of the last video frame (or libavformat does not
export it in a useful way), so whether or not we should use the demuxer
reported framerate for the last frame is questionable. (Still, why would
you essentially just discard the last frame?)

The timing logic is kept, but disabled for video with "normal" FPS
values. In particular, we want to keep it for displaying images, which
implicitly set the frame duration to 1 second by reporting 1 FPS. It's
also good for slide shows with mf://.

Fixes #2745.
2016-01-22 00:25:44 +01:00

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stddef.h>
#include <stdbool.h>
#include <inttypes.h>
#include <math.h>
#include <assert.h>
#include "config.h"
#include "mpv_talloc.h"
#include "common/msg.h"
#include "options/options.h"
#include "options/m_config.h"
#include "options/m_option.h"
#include "common/common.h"
#include "common/encode.h"
#include "options/m_property.h"
#include "osdep/timer.h"
#include "audio/out/ao.h"
#include "demux/demux.h"
#include "stream/stream.h"
#include "sub/osd.h"
#include "video/hwdec.h"
#include "video/filter/vf.h"
#include "video/decode/dec_video.h"
#include "video/decode/vd.h"
#include "video/out/vo.h"
#include "audio/filter/af.h"
#include "audio/decode/dec_audio.h"
#include "core.h"
#include "command.h"
#include "screenshot.h"
enum {
// update_video() - code also uses: <0 error, 0 eof, >0 progress
VD_ERROR = -1,
VD_EOF = 0, // end of file - no new output
VD_PROGRESS = 1, // progress, but no output; repeat call with no waiting
VD_NEW_FRAME = 2, // the call produced a new frame
VD_WAIT = 3, // no EOF, but no output; wait until wakeup
VD_RECONFIG = 4,
};
static const char av_desync_help_text[] =
"\n"
"Audio/Video desynchronisation detected! Possible reasons include too slow\n"
"hardware, temporary CPU spikes, broken drivers, and broken files. Audio\n"
"position will not match to the video (see A-V status field).\n"
"\n";
int video_set_colors(struct vo_chain *vo_c, const char *item, int value)
{
vf_equalizer_t data;
data.item = item;
data.value = value;
MP_VERBOSE(vo_c, "set video colors %s=%d \n", item, value);
if (video_vf_vo_control(vo_c, VFCTRL_SET_EQUALIZER, &data) == CONTROL_TRUE)
return 1;
MP_VERBOSE(vo_c, "Video attribute '%s' is not supported by selected vo.\n",
item);
return 0;
}
int video_get_colors(struct vo_chain *vo_c, const char *item, int *value)
{
vf_equalizer_t data;
data.item = item;
MP_VERBOSE(vo_c, "get video colors %s \n", item);
if (video_vf_vo_control(vo_c, VFCTRL_GET_EQUALIZER, &data) == CONTROL_TRUE) {
*value = data.value;
return 1;
}
return 0;
}
// Send a VCTRL, or if it doesn't work, translate it to a VOCTRL and try the VO.
int video_vf_vo_control(struct vo_chain *vo_c, int vf_cmd, void *data)
{
if (vo_c->vf->initialized > 0) {
int r = vf_control_any(vo_c->vf, vf_cmd, data);
if (r != CONTROL_UNKNOWN)
return r;
}
switch (vf_cmd) {
case VFCTRL_GET_DEINTERLACE:
return vo_control(vo_c->vo, VOCTRL_GET_DEINTERLACE, data) == VO_TRUE;
case VFCTRL_SET_DEINTERLACE:
return vo_control(vo_c->vo, VOCTRL_SET_DEINTERLACE, data) == VO_TRUE;
case VFCTRL_SET_EQUALIZER: {
vf_equalizer_t *eq = data;
if (!vo_c->vo->config_ok)
return CONTROL_FALSE; // vo not configured?
struct voctrl_set_equalizer_args param = {
eq->item, eq->value
};
return vo_control(vo_c->vo, VOCTRL_SET_EQUALIZER, &param) == VO_TRUE;
}
case VFCTRL_GET_EQUALIZER: {
vf_equalizer_t *eq = data;
if (!vo_c->vo->config_ok)
return CONTROL_FALSE; // vo not configured?
struct voctrl_get_equalizer_args param = {
eq->item, &eq->value
};
return vo_control(vo_c->vo, VOCTRL_GET_EQUALIZER, &param) == VO_TRUE;
}
}
return CONTROL_UNKNOWN;
}
static void set_allowed_vo_formats(struct vo_chain *vo_c)
{
vo_query_formats(vo_c->vo, vo_c->vf->allowed_output_formats);
}
static int try_filter(struct vo_chain *vo_c, struct mp_image_params params,
char *name, char *label, char **args)
{
struct vf_instance *vf = vf_append_filter(vo_c->vf, name, args);
if (!vf)
return -1;
vf->label = talloc_strdup(vf, label);
if (vf_reconfig(vo_c->vf, &params) < 0) {
vf_remove_filter(vo_c->vf, vf);
// restore
vf_reconfig(vo_c->vf, &params);
return -1;
}
return 0;
}
// Reconfigure the filter chain according to the new input format.
static void filter_reconfig(struct vo_chain *vo_c)
{
struct mp_image_params params = vo_c->input_format;
if (!params.imgfmt)
return;
set_allowed_vo_formats(vo_c);
if (vf_reconfig(vo_c->vf, &params) < 0)
return;
if (params.rotate && (params.rotate % 90 == 0)) {
if (!(vo_c->vo->driver->caps & VO_CAP_ROTATE90)) {
// Try to insert a rotation filter.
char *args[] = {"angle", "auto", NULL};
if (try_filter(vo_c, params, "rotate", "autorotate", args) >= 0) {
params.rotate = 0;
} else {
MP_ERR(vo_c, "Can't insert rotation filter.\n");
}
}
}
if (params.stereo_in != params.stereo_out &&
params.stereo_in > 0 && params.stereo_out >= 0)
{
char *to = (char *)MP_STEREO3D_NAME(params.stereo_out);
if (to) {
char *args[] = {"in", "auto", "out", to, NULL, NULL};
if (try_filter(vo_c, params, "stereo3d", "stereo3d", args) < 0)
MP_ERR(vo_c, "Can't insert 3D conversion filter.\n");
}
}
}
static void recreate_video_filters(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
struct vo_chain *vo_c = mpctx->vo_chain;
assert(vo_c);
vf_destroy(vo_c->vf);
vo_c->vf = vf_new(mpctx->global);
vo_c->vf->hwdec = vo_c->hwdec_info;
vo_c->vf->wakeup_callback = wakeup_playloop;
vo_c->vf->wakeup_callback_ctx = mpctx;
vo_c->vf->container_fps = vo_c->container_fps;
vo_control(vo_c->vo, VOCTRL_GET_DISPLAY_FPS, &vo_c->vf->display_fps);
vf_append_filter_list(vo_c->vf, opts->vf_settings);
// for vf_sub
osd_set_render_subs_in_filter(mpctx->osd,
vf_control_any(vo_c->vf, VFCTRL_INIT_OSD, mpctx->osd) > 0);
set_allowed_vo_formats(vo_c);
}
int reinit_video_filters(struct MPContext *mpctx)
{
struct vo_chain *vo_c = mpctx->vo_chain;
if (!vo_c)
return 0;
bool need_reconfig = vo_c->vf->initialized != 0;
recreate_video_filters(mpctx);
if (need_reconfig)
filter_reconfig(vo_c);
mp_notify(mpctx, MPV_EVENT_VIDEO_RECONFIG, NULL);
return vo_c->vf->initialized;
}
static void vo_chain_reset_state(struct vo_chain *vo_c)
{
mp_image_unrefp(&vo_c->input_mpi);
if (vo_c->vf->initialized == 1)
vf_seek_reset(vo_c->vf);
vo_seek_reset(vo_c->vo);
}
void reset_video_state(struct MPContext *mpctx)
{
if (mpctx->vo_chain) {
video_reset(mpctx->vo_chain->video_src);
vo_chain_reset_state(mpctx->vo_chain);
}
for (int n = 0; n < mpctx->num_next_frames; n++)
mp_image_unrefp(&mpctx->next_frames[n]);
mpctx->num_next_frames = 0;
mp_image_unrefp(&mpctx->saved_frame);
mpctx->delay = 0;
mpctx->time_frame = 0;
mpctx->video_pts = MP_NOPTS_VALUE;
mpctx->video_next_pts = MP_NOPTS_VALUE;
mpctx->num_past_frames = 0;
mpctx->total_avsync_change = 0;
mpctx->last_av_difference = 0;
mpctx->dropped_frames_start = 0;
mpctx->mistimed_frames_total = 0;
mpctx->drop_message_shown = 0;
mpctx->display_sync_drift_dir = 0;
mpctx->display_sync_broken = false;
mpctx->video_status = mpctx->vo_chain ? STATUS_SYNCING : STATUS_EOF;
}
void uninit_video_out(struct MPContext *mpctx)
{
uninit_video_chain(mpctx);
if (mpctx->video_out) {
vo_destroy(mpctx->video_out);
mp_notify(mpctx, MPV_EVENT_VIDEO_RECONFIG, NULL);
}
mpctx->video_out = NULL;
}
static void vo_chain_uninit(struct vo_chain *vo_c)
{
mp_image_unrefp(&vo_c->input_mpi);
vf_destroy(vo_c->vf);
talloc_free(vo_c);
// this does not free the VO
}
void uninit_video_chain(struct MPContext *mpctx)
{
if (mpctx->vo_chain) {
struct track *track = mpctx->current_track[0][STREAM_VIDEO];
assert(track);
assert(track->d_video == mpctx->vo_chain->video_src);
reset_video_state(mpctx);
video_uninit(track->d_video);
track->d_video = NULL;
mpctx->vo_chain->video_src = NULL;
vo_chain_uninit(mpctx->vo_chain);
mpctx->vo_chain = NULL;
mpctx->video_status = STATUS_EOF;
mpctx->sync_audio_to_video = false;
reselect_demux_streams(mpctx);
remove_deint_filter(mpctx);
mp_notify(mpctx, MPV_EVENT_VIDEO_RECONFIG, NULL);
}
}
int reinit_video_chain(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
assert(!mpctx->vo_chain);
struct track *track = mpctx->current_track[0][STREAM_VIDEO];
struct sh_stream *sh = track ? track->stream : NULL;
if (!sh)
goto no_video;
if (!mpctx->video_out) {
struct vo_extra ex = {
.input_ctx = mpctx->input,
.osd = mpctx->osd,
.encode_lavc_ctx = mpctx->encode_lavc_ctx,
.opengl_cb_context = mpctx->gl_cb_ctx,
};
mpctx->video_out = init_best_video_out(mpctx->global, &ex);
if (!mpctx->video_out) {
MP_FATAL(mpctx, "Error opening/initializing "
"the selected video_out (-vo) device.\n");
mpctx->error_playing = MPV_ERROR_VO_INIT_FAILED;
goto err_out;
}
mpctx->mouse_cursor_visible = true;
}
update_window_title(mpctx, true);
struct vo_chain *vo_c = talloc_zero(NULL, struct vo_chain);
mpctx->vo_chain = vo_c;
vo_c->log = mpctx->log;
vo_c->vo = mpctx->video_out;
vo_control(vo_c->vo, VOCTRL_GET_HWDEC_INFO, &vo_c->hwdec_info);
track->d_video = talloc_zero(NULL, struct dec_video);
struct dec_video *d_video = track->d_video;
d_video->global = mpctx->global;
d_video->log = mp_log_new(d_video, mpctx->log, "!vd");
d_video->opts = mpctx->opts;
d_video->header = sh;
d_video->fps = sh->codec->fps;
d_video->hwdec_info = vo_c->hwdec_info;
MP_VERBOSE(d_video, "Container reported FPS: %f\n", sh->codec->fps);
if (opts->force_fps) {
d_video->fps = opts->force_fps;
MP_INFO(mpctx, "FPS forced to %5.3f.\n", d_video->fps);
MP_INFO(mpctx, "Use --no-correct-pts to force FPS based timing.\n");
}
vo_c->container_fps = d_video->fps;
vo_c->video_src = d_video;
#if HAVE_ENCODING
if (mpctx->encode_lavc_ctx)
encode_lavc_set_video_fps(mpctx->encode_lavc_ctx, d_video->fps);
#endif
recreate_video_filters(mpctx);
if (!video_init_best_codec(d_video, opts->video_decoders))
goto err_out;
bool saver_state = opts->pause || !opts->stop_screensaver;
vo_control(vo_c->vo, saver_state ? VOCTRL_RESTORE_SCREENSAVER
: VOCTRL_KILL_SCREENSAVER, NULL);
vo_set_paused(vo_c->vo, mpctx->paused);
mpctx->sync_audio_to_video = !sh->attached_picture;
// If we switch on video again, ensure audio position matches up.
if (mpctx->ao_chain)
mpctx->audio_status = STATUS_SYNCING;
reset_video_state(mpctx);
reset_subtitle_state(mpctx);
return 1;
err_out:
no_video:
uninit_video_chain(mpctx);
if (track)
error_on_track(mpctx, track);
handle_force_window(mpctx, true);
return 0;
}
// Try to refresh the video by doing a precise seek to the currently displayed
// frame. This can go wrong in all sorts of ways, so use sparingly.
void mp_force_video_refresh(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
struct vo_chain *vo_c = mpctx->vo_chain;
if (!vo_c || !vo_c->input_format.imgfmt)
return;
// If not paused, the next frame should come soon enough.
if (opts->pause && mpctx->video_status == STATUS_PLAYING &&
mpctx->last_vo_pts != MP_NOPTS_VALUE)
{
queue_seek(mpctx, MPSEEK_ABSOLUTE, mpctx->last_vo_pts,
MPSEEK_VERY_EXACT, true);
}
}
static bool check_framedrop(struct MPContext *mpctx, struct vo_chain *vo_c)
{
struct MPOpts *opts = mpctx->opts;
// check for frame-drop:
if (mpctx->video_status == STATUS_PLAYING && !mpctx->paused &&
mpctx->audio_status == STATUS_PLAYING && !ao_untimed(mpctx->ao))
{
float fps = vo_c->container_fps;
double frame_time = fps > 0 ? 1.0 / fps : 0;
// we should avoid dropping too many frames in sequence unless we
// are too late. and we allow 100ms A-V delay here:
int dropped_frames =
vo_c->video_src->dropped_frames - mpctx->dropped_frames_start;
if (mpctx->last_av_difference - 0.100 > dropped_frames * frame_time)
return !!(opts->frame_dropping & 2);
}
return false;
}
// Read a packet, store decoded image into d_video->waiting_decoded_mpi
// returns VD_* code
static int decode_image(struct MPContext *mpctx)
{
struct vo_chain *vo_c = mpctx->vo_chain;
struct dec_video *d_video = vo_c->video_src;
bool hrseek = mpctx->hrseek_active && mpctx->video_status == STATUS_SYNCING &&
mpctx->hrseek_framedrop;
video_set_start(d_video, hrseek ? mpctx->hrseek_pts : MP_NOPTS_VALUE);
video_set_framedrop(d_video, check_framedrop(mpctx, vo_c));
video_work(d_video);
assert(!vo_c->input_mpi);
int st = video_get_frame(d_video, &vo_c->input_mpi);
if (vo_c->input_mpi)
vo_c->input_format = vo_c->input_mpi->params;
switch (st) {
case VIDEO_WAIT: return VD_WAIT;
case VIDEO_EOF: return VD_EOF;
default: return VD_PROGRESS;
}
}
// Called after video reinit. This can be generally used to try to insert more
// filters using the filter chain edit functionality in command.c.
static void init_filter_params(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
// Note that the filter chain is already initialized. This code might
// recreate the chain a second time, which is not very elegant, but allows
// us to test whether enabling deinterlacing works with the current video
// format and other filters.
if (opts->deinterlace >= 0) {
remove_deint_filter(mpctx);
set_deinterlacing(mpctx, opts->deinterlace != 0);
}
}
// Feed newly decoded frames to the filter, take care of format changes.
// If eof=true, drain the filter chain, and return VD_EOF if empty.
static int video_filter(struct MPContext *mpctx, bool eof)
{
struct vo_chain *vo_c = mpctx->vo_chain;
struct vf_chain *vf = vo_c->vf;
if (vf->initialized < 0)
return VD_ERROR;
// There is already a filtered frame available.
// If vf_needs_input() returns > 0, the filter wants input anyway.
if (vf_output_frame(vf, eof) > 0 && vf_needs_input(vf) < 1)
return VD_PROGRESS;
// Decoder output is different from filter input?
bool need_vf_reconfig = !vf->input_params.imgfmt || vf->initialized < 1 ||
!mp_image_params_equal(&vo_c->input_format, &vf->input_params);
// (If imgfmt==0, nothing was decoded yet, and the format is unknown.)
if (need_vf_reconfig && vo_c->input_format.imgfmt) {
// Drain the filter chain.
if (vf_output_frame(vf, true) > 0)
return VD_PROGRESS;
// The filter chain is drained; execute the filter format change.
filter_reconfig(mpctx->vo_chain);
mp_notify(mpctx, MPV_EVENT_VIDEO_RECONFIG, NULL);
// Most video filters don't work with hardware decoding, so this
// might be the reason why filter reconfig failed.
if (vf->initialized < 0 &&
video_vd_control(vo_c->video_src, VDCTRL_FORCE_HWDEC_FALLBACK, NULL)
== CONTROL_OK)
{
// Fallback active; decoder will return software format next
// time. Don't abort video decoding.
vf->initialized = 0;
mp_image_unrefp(&vo_c->input_mpi);
vo_c->input_format = (struct mp_image_params){0};
MP_VERBOSE(mpctx, "hwdec falback due to filters.\n");
return VD_PROGRESS; // try again
}
if (vf->initialized < 1) {
MP_FATAL(mpctx, "Cannot initialize video filters.\n");
return VD_ERROR;
}
init_filter_params(mpctx);
return VD_RECONFIG;
}
// If something was decoded, and the filter chain is ready, filter it.
if (!need_vf_reconfig && vo_c->input_mpi) {
vf_filter_frame(vf, vo_c->input_mpi);
vo_c->input_mpi = NULL;
return VD_PROGRESS;
}
return eof ? VD_EOF : VD_PROGRESS;
}
// Make sure at least 1 filtered image is available, decode new video if needed.
// returns VD_* code
// A return value of VD_PROGRESS doesn't necessarily output a frame, but makes
// the promise that calling this function again will eventually do something.
static int video_decode_and_filter(struct MPContext *mpctx)
{
struct vo_chain *vo_c = mpctx->vo_chain;
int r = video_filter(mpctx, false);
if (r < 0)
return r;
if (!vo_c->input_mpi) {
// Decode a new image, or at least feed the decoder a packet.
r = decode_image(mpctx);
if (r == VD_WAIT)
return r;
}
bool eof = !vo_c->input_mpi && (r == VD_EOF || r < 0);
r = video_filter(mpctx, eof);
if (r == VD_RECONFIG) // retry feeding decoded image
r = video_filter(mpctx, eof);
return r;
}
static int video_feed_async_filter(struct MPContext *mpctx)
{
struct vf_chain *vf = mpctx->vo_chain->vf;
if (vf->initialized < 0)
return VD_ERROR;
if (vf_needs_input(vf) < 1)
return 0;
mpctx->sleeptime = 0; // retry until done
return video_decode_and_filter(mpctx);
}
/* Modify video timing to match the audio timeline. There are two main
* reasons this is needed. First, video and audio can start from different
* positions at beginning of file or after a seek (MPlayer starts both
* immediately even if they have different pts). Second, the file can have
* audio timestamps that are inconsistent with the duration of the audio
* packets, for example two consecutive timestamp values differing by
* one second but only a packet with enough samples for half a second
* of playback between them.
*/
static void adjust_sync(struct MPContext *mpctx, double v_pts, double frame_time)
{
struct MPOpts *opts = mpctx->opts;
if (mpctx->audio_status != STATUS_PLAYING)
return;
double a_pts = written_audio_pts(mpctx) + opts->audio_delay - mpctx->delay;
double av_delay = a_pts - v_pts;
double change = av_delay * 0.1;
double max_change = opts->default_max_pts_correction >= 0 ?
opts->default_max_pts_correction : frame_time * 0.1;
if (change < -max_change)
change = -max_change;
else if (change > max_change)
change = max_change;
mpctx->delay += change;
mpctx->total_avsync_change += change;
if (mpctx->display_sync_active)
mpctx->total_avsync_change = 0;
}
// Make the frame at position 0 "known" to the playback logic. This must happen
// only once for each frame, so this function has to be called carefully.
// Generally, if position 0 gets a new frame, this must be called.
static void handle_new_frame(struct MPContext *mpctx)
{
assert(mpctx->num_next_frames >= 1);
double frame_time = 0;
double pts = mpctx->next_frames[0]->pts;
if (mpctx->video_pts != MP_NOPTS_VALUE) {
frame_time = pts - mpctx->video_pts;
double tolerance = 15;
if (frame_time <= 0 || frame_time >= tolerance) {
// Assume a discontinuity.
MP_WARN(mpctx, "Invalid video timestamp: %f -> %f\n",
mpctx->video_pts, pts);
frame_time = 0;
}
}
mpctx->video_next_pts = pts;
mpctx->delay -= frame_time;
if (mpctx->video_status >= STATUS_PLAYING) {
mpctx->time_frame += frame_time / mpctx->video_speed;
adjust_sync(mpctx, pts, frame_time);
}
mpctx->dropped_frames_start = mpctx->vo_chain->video_src->dropped_frames;
MP_TRACE(mpctx, "frametime=%5.3f\n", frame_time);
}
// Remove the first frame in mpctx->next_frames
static void shift_frames(struct MPContext *mpctx)
{
if (mpctx->num_next_frames < 1)
return;
talloc_free(mpctx->next_frames[0]);
for (int n = 0; n < mpctx->num_next_frames - 1; n++)
mpctx->next_frames[n] = mpctx->next_frames[n + 1];
mpctx->num_next_frames -= 1;
}
static int get_req_frames(struct MPContext *mpctx, bool eof)
{
// On EOF, drain all frames.
if (eof)
return 1;
// On the first frame, output a new frame as quickly as possible.
// But display-sync likes to have a correct frame duration always.
if (mpctx->video_pts == MP_NOPTS_VALUE)
return mpctx->opts->video_sync == VS_DEFAULT ? 1 : 2;
int req = vo_get_num_req_frames(mpctx->video_out);
return MPCLAMP(req, 2, MP_ARRAY_SIZE(mpctx->next_frames) - 1);
}
// Whether it's fine to call add_new_frame() now.
static bool needs_new_frame(struct MPContext *mpctx)
{
return mpctx->num_next_frames < get_req_frames(mpctx, false);
}
// Queue a frame to mpctx->next_frames[]. Call only if needs_new_frame() signals ok.
static void add_new_frame(struct MPContext *mpctx, struct mp_image *frame)
{
assert(mpctx->num_next_frames < MP_ARRAY_SIZE(mpctx->next_frames));
assert(frame);
mpctx->next_frames[mpctx->num_next_frames++] = frame;
if (mpctx->num_next_frames == 1)
handle_new_frame(mpctx);
}
// Enough video filtered already to push one frame to the VO?
// Set eof to true if no new frames are to be expected.
static bool have_new_frame(struct MPContext *mpctx, bool eof)
{
return mpctx->num_next_frames >= get_req_frames(mpctx, eof);
}
// Fill mpctx->next_frames[] with a newly filtered or decoded image.
// returns VD_* code
static int video_output_image(struct MPContext *mpctx, double endpts)
{
bool hrseek = mpctx->hrseek_active && mpctx->video_status == STATUS_SYNCING;
struct track *track = mpctx->current_track[0][STREAM_VIDEO];
if (track && track->stream && track->stream->attached_picture) {
if (vo_has_frame(mpctx->video_out))
return VD_EOF;
hrseek = false;
}
if (have_new_frame(mpctx, false))
return VD_NEW_FRAME;
// Get a new frame if we need one.
int r = VD_PROGRESS;
if (needs_new_frame(mpctx)) {
// Filter a new frame.
r = video_decode_and_filter(mpctx);
if (r < 0)
return r; // error
struct mp_image *img = vf_read_output_frame(mpctx->vo_chain->vf);
if (img) {
if (endpts != MP_NOPTS_VALUE && img->pts >= endpts) {
r = VD_EOF;
} else if (mpctx->max_frames == 0) {
r = VD_EOF;
} else if (hrseek && mpctx->hrseek_lastframe) {
mp_image_setrefp(&mpctx->saved_frame, img);
} else if (hrseek && img->pts < mpctx->hrseek_pts - .005) {
/* just skip - but save if backstep active */
if (mpctx->hrseek_backstep)
mp_image_setrefp(&mpctx->saved_frame, img);
} else {
if (hrseek && mpctx->hrseek_backstep) {
if (mpctx->saved_frame) {
add_new_frame(mpctx, mpctx->saved_frame);
mpctx->saved_frame = NULL;
} else {
MP_WARN(mpctx, "Backstep failed.\n");
}
mpctx->hrseek_backstep = false;
}
add_new_frame(mpctx, img);
img = NULL;
}
talloc_free(img);
}
}
// Last-frame seek
if (r <= 0 && hrseek && mpctx->hrseek_lastframe && mpctx->saved_frame) {
add_new_frame(mpctx, mpctx->saved_frame);
mpctx->saved_frame = NULL;
r = VD_PROGRESS;
}
return have_new_frame(mpctx, r <= 0) ? VD_NEW_FRAME : r;
}
/* Update avsync before a new video frame is displayed. Actually, this can be
* called arbitrarily often before the actual display.
* This adjusts the time of the next video frame */
static void update_avsync_before_frame(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
struct vo *vo = mpctx->video_out;
if (!mpctx->sync_audio_to_video || mpctx->video_status < STATUS_READY) {
mpctx->time_frame = 0;
} else if (mpctx->display_sync_active || opts->video_sync == VS_NONE) {
// don't touch the timing
} else if (mpctx->audio_status == STATUS_PLAYING &&
mpctx->video_status == STATUS_PLAYING &&
!ao_untimed(mpctx->ao))
{
double buffered_audio = ao_get_delay(mpctx->ao);
double predicted = mpctx->delay / mpctx->video_speed +
mpctx->time_frame;
double difference = buffered_audio - predicted;
MP_STATS(mpctx, "value %f audio-diff", difference);
if (opts->autosync) {
/* Smooth reported playback position from AO by averaging
* it with the value expected based on previus value and
* time elapsed since then. May help smooth video timing
* with audio output that have inaccurate position reporting.
* This is badly implemented; the behavior of the smoothing
* now undesirably depends on how often this code runs
* (mainly depends on video frame rate). */
buffered_audio = predicted + difference / opts->autosync;
}
mpctx->time_frame = buffered_audio - mpctx->delay / mpctx->video_speed;
} else {
/* If we're more than 200 ms behind the right playback
* position, don't try to speed up display of following
* frames to catch up; continue with default speed from
* the current frame instead.
* If untimed is set always output frames immediately
* without sleeping.
*/
if (mpctx->time_frame < -0.2 || opts->untimed || vo->driver->untimed)
mpctx->time_frame = 0;
}
}
// Update the A/V sync difference when a new video frame is being shown.
static void update_av_diff(struct MPContext *mpctx, double offset)
{
struct MPOpts *opts = mpctx->opts;
mpctx->last_av_difference = 0;
if (mpctx->audio_status != STATUS_PLAYING ||
mpctx->video_status != STATUS_PLAYING)
return;
double a_pos = playing_audio_pts(mpctx);
if (a_pos != MP_NOPTS_VALUE && mpctx->video_pts != MP_NOPTS_VALUE) {
mpctx->last_av_difference = a_pos - mpctx->video_pts
+ opts->audio_delay + offset;
}
if (fabs(mpctx->last_av_difference) > 0.5 && !mpctx->drop_message_shown) {
MP_WARN(mpctx, "%s", av_desync_help_text);
mpctx->drop_message_shown = true;
}
}
static void init_vo(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
struct vo_chain *vo_c = mpctx->vo_chain;
if (opts->gamma_gamma != 1000)
video_set_colors(vo_c, "gamma", opts->gamma_gamma);
if (opts->gamma_brightness != 1000)
video_set_colors(vo_c, "brightness", opts->gamma_brightness);
if (opts->gamma_contrast != 1000)
video_set_colors(vo_c, "contrast", opts->gamma_contrast);
if (opts->gamma_saturation != 1000)
video_set_colors(vo_c, "saturation", opts->gamma_saturation);
if (opts->gamma_hue != 1000)
video_set_colors(vo_c, "hue", opts->gamma_hue);
video_set_colors(vo_c, "output-levels", opts->video_output_levels);
mp_notify(mpctx, MPV_EVENT_VIDEO_RECONFIG, NULL);
}
double calc_average_frame_duration(struct MPContext *mpctx)
{
double total = 0;
int num = 0;
for (int n = 0; n < mpctx->num_past_frames; n++) {
double dur = mpctx->past_frames[0].approx_duration;
if (dur <= 0)
continue;
total += dur;
num += 1;
}
return num > 0 ? total / num : 0;
}
// Find a speed factor such that the display FPS is an integer multiple of the
// effective video FPS. If this is not possible, try to do it for multiples,
// which still leads to an improved end result.
// Both parameters are durations in seconds.
static double calc_best_speed(double vsync, double frame)
{
double ratio = frame / vsync;
double best_scale = -1;
double best_dev = INFINITY;
for (int factor = 1; factor <= 5; factor++) {
double scale = ratio * factor / rint(ratio * factor);
double dev = fabs(scale - 1);
if (dev < best_dev) {
best_scale = scale;
best_dev = dev;
}
}
return best_scale;
}
static double find_best_speed(struct MPContext *mpctx, double vsync)
{
double total = 0;
int num = 0;
for (int n = 0; n < mpctx->num_past_frames; n++) {
double dur = mpctx->past_frames[n].approx_duration;
if (dur <= 0)
continue;
total += calc_best_speed(vsync, dur / mpctx->opts->playback_speed);
num++;
}
return num > 0 ? total / num : 1;
}
static bool using_spdif_passthrough(struct MPContext *mpctx)
{
if (mpctx->ao_chain)
return !af_fmt_is_pcm(mpctx->ao_chain->input_format.format);
return false;
}
// Compute the relative audio speed difference by taking A/V dsync into account.
static double compute_audio_drift(struct MPContext *mpctx, double vsync)
{
// Least-squares linear regression, using relative real time for x, and
// audio desync for y. Assume speed didn't change for the frames we're
// looking at for simplicity. This also should actually use the realtime
// (minus paused time) for x, but use vsync scheduling points instead.
if (mpctx->num_past_frames <= 10)
return NAN;
int num = mpctx->num_past_frames - 1;
double sum_x = 0, sum_y = 0, sum_xy = 0, sum_xx = 0;
double x = 0;
for (int n = 0; n < num; n++) {
struct frame_info *frame = &mpctx->past_frames[n + 1];
if (frame->num_vsyncs < 0)
return NAN;
double y = frame->av_diff;
sum_x += x;
sum_y += y;
sum_xy += x * y;
sum_xx += x * x;
x -= frame->num_vsyncs * vsync;
}
return (sum_x * sum_y - num * sum_xy) / (sum_x * sum_x - num * sum_xx);
}
static void adjust_audio_resample_speed(struct MPContext *mpctx, double vsync)
{
struct MPOpts *opts = mpctx->opts;
int mode = opts->video_sync;
if (mode != VS_DISP_RESAMPLE || mpctx->audio_status != STATUS_PLAYING) {
mpctx->speed_factor_a = mpctx->speed_factor_v;
return;
}
// Try to smooth out audio timing drifts. This can happen if either
// video isn't playing at expected speed, or audio is not playing at
// the requested speed. Both are unavoidable.
// The audio desync is made up of 2 parts: 1. drift due to rounding
// errors and imperfect information, and 2. an offset, due to
// unaligned audio/video start, or disruptive events halting audio
// or video for a small time.
// Instead of trying to be clever, just apply an awfully dumb drift
// compensation with a constant factor, which does what we want. In
// theory we could calculate the exact drift compensation needed,
// but it likely would be wrong anyway, and we'd run into the same
// issues again, except with more complex code.
// 1 means drifts to positive, -1 means drifts to negative
double max_drift = vsync / 2;
double av_diff = mpctx->last_av_difference;
int new = mpctx->display_sync_drift_dir;
if (av_diff * -mpctx->display_sync_drift_dir >= 0)
new = 0;
if (fabs(av_diff) > max_drift)
new = av_diff >= 0 ? 1 : -1;
bool change = mpctx->display_sync_drift_dir != new;
if (new || change) {
if (change)
MP_VERBOSE(mpctx, "Change display sync audio drift: %d\n", new);
mpctx->display_sync_drift_dir = new;
double max_correct = opts->sync_max_audio_change / 100;
double audio_factor = 1 + max_correct * -mpctx->display_sync_drift_dir;
if (new == 0) {
// If we're resetting, actually try to be clever and pick a speed
// which compensates the general drift we're getting.
double drift = compute_audio_drift(mpctx, vsync);
if (isnormal(drift)) {
// other = will be multiplied with audio_factor for final speed
double other = mpctx->opts->playback_speed * mpctx->speed_factor_v;
audio_factor = (mpctx->audio_speed - drift) / other;
MP_VERBOSE(mpctx, "Compensation factor: %f\n", audio_factor);
}
}
audio_factor = MPCLAMP(audio_factor, 1 - max_correct, 1 + max_correct);
mpctx->speed_factor_a = audio_factor * mpctx->speed_factor_v;
}
}
// Manipulate frame timing for display sync, or do nothing for normal timing.
static void handle_display_sync_frame(struct MPContext *mpctx,
struct vo_frame *frame)
{
struct MPOpts *opts = mpctx->opts;
struct vo *vo = mpctx->video_out;
int mode = opts->video_sync;
if (!mpctx->display_sync_active) {
mpctx->display_sync_error = 0.0;
mpctx->display_sync_drift_dir = 0;
}
mpctx->display_sync_active = false;
if (!VS_IS_DISP(mode) || mpctx->display_sync_broken)
return;
bool resample = mode == VS_DISP_RESAMPLE || mode == VS_DISP_RESAMPLE_VDROP ||
mode == VS_DISP_RESAMPLE_NONE;
bool drop = mode == VS_DISP_VDROP || mode == VS_DISP_RESAMPLE ||
mode == VS_DISP_ADROP || mode == VS_DISP_RESAMPLE_VDROP;
drop &= (opts->frame_dropping & 1);
if (resample && using_spdif_passthrough(mpctx))
return;
double vsync = vo_get_vsync_interval(vo) / 1e6;
if (vsync <= 0)
return;
double adjusted_duration = MPMAX(0, mpctx->past_frames[0].approx_duration);
adjusted_duration /= opts->playback_speed;
if (adjusted_duration > 0.5)
return;
mpctx->speed_factor_v = 1.0;
if (mode != VS_DISP_VDROP) {
double best = find_best_speed(mpctx, vsync);
// If it doesn't work, play at normal speed.
if (fabs(best - 1.0) <= opts->sync_max_video_change / 100)
mpctx->speed_factor_v = best;
}
double av_diff = mpctx->last_av_difference;
if (fabs(av_diff) > 0.5) {
mpctx->display_sync_broken = true;
return;
}
// Determine for how many vsyncs a frame should be displayed. This can be
// e.g. 2 for 30hz on a 60hz display. It can also be 0 if the video
// framerate is higher than the display framerate.
// We use the speed-adjusted (i.e. real) frame duration for this.
double frame_duration = adjusted_duration / mpctx->speed_factor_v;
double ratio = (frame_duration + mpctx->display_sync_error) / vsync;
int num_vsyncs = MPMAX(lrint(ratio), 0);
double prev_error = mpctx->display_sync_error;
mpctx->display_sync_error += frame_duration - num_vsyncs * vsync;
MP_DBG(mpctx, "s=%f vsyncs=%d dur=%f ratio=%f err=%.20f (%f/%f)\n",
mpctx->speed_factor_v, num_vsyncs, adjusted_duration, ratio,
mpctx->display_sync_error, mpctx->display_sync_error / vsync,
mpctx->display_sync_error / frame_duration);
MP_STATS(mpctx, "value %f avdiff", av_diff);
// Intended number of additional display frames to drop (<0) or repeat (>0)
int drop_repeat = 0;
// If we are too far ahead/behind, attempt to drop/repeat frames.
// Tolerate some desync to avoid frame dropping due to jitter.
if (drop && fabs(av_diff) >= 0.020 && fabs(av_diff) / vsync >= 1)
drop_repeat = -av_diff / vsync; // round towards 0
// We can only drop all frames at most. We can repeat much more frames,
// but we still limit it to 10 times the original frames to avoid that
// corner cases or exceptional situations cause too much havoc.
drop_repeat = MPCLAMP(drop_repeat, -num_vsyncs, num_vsyncs * 10);
num_vsyncs += drop_repeat;
// Estimate the video position, so we can calculate a good A/V difference
// value below. This is used to estimate A/V drift.
double time_left = vo_get_delay(vo);
// We also know that the timing is (necessarily) off, because we have to
// align frame timings on the vsync boundaries. This is unavoidable, and
// for the sake of the A/V sync calculations we pretend it's perfect.
time_left += prev_error;
// Likewise, we know sync is off, but is going to be compensated.
time_left += drop_repeat * vsync;
if (drop_repeat) {
mpctx->mistimed_frames_total += 1;
MP_STATS(mpctx, "mistimed");
}
mpctx->total_avsync_change = 0;
update_av_diff(mpctx, time_left * opts->playback_speed);
mpctx->past_frames[0].num_vsyncs = num_vsyncs;
mpctx->past_frames[0].av_diff = mpctx->last_av_difference;
if (resample) {
adjust_audio_resample_speed(mpctx, vsync);
} else {
mpctx->speed_factor_a = 1.0;
}
// A bad guess, only needed when reverting to audio sync.
mpctx->time_frame = time_left;
frame->vsync_interval = vsync;
frame->vsync_offset = -prev_error;
frame->ideal_frame_duration = frame_duration;
frame->num_vsyncs = num_vsyncs;
frame->display_synced = true;
mpctx->display_sync_active = true;
update_playback_speed(mpctx);
MP_STATS(mpctx, "value %f aspeed", mpctx->speed_factor_a - 1);
MP_STATS(mpctx, "value %f vspeed", mpctx->speed_factor_v - 1);
}
static void schedule_frame(struct MPContext *mpctx, struct vo_frame *frame)
{
handle_display_sync_frame(mpctx, frame);
if (mpctx->num_past_frames > 1 &&
((mpctx->past_frames[1].num_vsyncs >= 0) != mpctx->display_sync_active))
{
MP_VERBOSE(mpctx, "Video sync mode %s.\n",
mpctx->display_sync_active ? "enabled" : "disabled");
}
if (!mpctx->display_sync_active) {
mpctx->speed_factor_a = 1.0;
mpctx->speed_factor_v = 1.0;
update_playback_speed(mpctx);
update_av_diff(mpctx, mpctx->time_frame > 0 ?
mpctx->time_frame * mpctx->video_speed : 0);
}
}
// Determine the mpctx->past_frames[0] frame duration.
static void calculate_frame_duration(struct MPContext *mpctx)
{
assert(mpctx->num_past_frames >= 1 && mpctx->num_next_frames >= 1);
double demux_duration = mpctx->vo_chain->container_fps > 0
? 1.0 / mpctx->vo_chain->container_fps : -1;
double duration = -1;
if (mpctx->num_next_frames >= 2) {
double pts0 = mpctx->next_frames[0]->pts;
double pts1 = mpctx->next_frames[1]->pts;
if (pts0 != MP_NOPTS_VALUE && pts1 != MP_NOPTS_VALUE && pts1 >= pts0)
duration = pts1 - pts0;
} else {
// E.g. last frame on EOF. Only use it if it's significant.
if (demux_duration >= 0.1)
duration = demux_duration;
}
// The following code tries to compensate for rounded Matroska timestamps
// by "unrounding" frame durations, or if not possible, approximating them.
// These formats usually round on 1ms. (Some muxers do this incorrectly,
// and might be off by 2ms or more, and compensate for it later by an
// equal rounding error into the opposite direction. Don't try to deal
// with them; too much potential damage to timing.)
double tolerance = 0.0011;
double total = 0;
int num_dur = 0;
for (int n = 1; n < mpctx->num_past_frames; n++) {
// Eliminate likely outliers using a really dumb heuristic.
double dur = mpctx->past_frames[n].duration;
if (dur <= 0 || fabs(dur - duration) >= tolerance)
break;
total += dur;
num_dur += 1;
}
double approx_duration = num_dur > 0 ? total / num_dur : duration;
// Try if the demuxer frame rate fits - if so, just take it.
if (demux_duration > 0) {
// Note that even if each timestamp is within rounding tolerance, it
// could literally not add up (e.g. if demuxer FPS is rounded itself).
if (fabs(duration - demux_duration) < tolerance &&
fabs(total - demux_duration * num_dur) < tolerance)
{
approx_duration = demux_duration;
}
}
mpctx->past_frames[0].duration = duration;
mpctx->past_frames[0].approx_duration = approx_duration;
}
void write_video(struct MPContext *mpctx, double endpts)
{
struct MPOpts *opts = mpctx->opts;
if (!mpctx->vo_chain)
return;
struct vo *vo = mpctx->vo_chain->vo;
// Actual playback starts when both audio and video are ready.
if (mpctx->video_status == STATUS_READY)
return;
if (mpctx->paused && mpctx->video_status >= STATUS_READY)
return;
int r = video_output_image(mpctx, endpts);
MP_TRACE(mpctx, "video_output_image: %d\n", r);
if (r < 0)
goto error;
if (r == VD_WAIT) // Demuxer will wake us up for more packets to decode.
return;
if (r == VD_EOF) {
int prev_state = mpctx->video_status;
mpctx->video_status = STATUS_EOF;
if (mpctx->num_past_frames > 0 && mpctx->past_frames[0].duration > 0) {
if (vo_still_displaying(vo))
mpctx->video_status = STATUS_DRAINING;
}
mpctx->delay = 0;
mpctx->last_av_difference = 0;
MP_DBG(mpctx, "video EOF (status=%d)\n", mpctx->video_status);
if (prev_state != mpctx->video_status)
mpctx->sleeptime = 0;
return;
}
if (mpctx->video_status > STATUS_PLAYING)
mpctx->video_status = STATUS_PLAYING;
if (r != VD_NEW_FRAME) {
mpctx->sleeptime = 0; // Decode more in next iteration.
return;
}
// Filter output is different from VO input?
struct mp_image_params p = mpctx->next_frames[0]->params;
if (!vo->params || !mp_image_params_equal(&p, vo->params)) {
// Changing config deletes the current frame; wait until it's finished.
if (vo_still_displaying(vo))
return;
const struct vo_driver *info = mpctx->video_out->driver;
char extra[20] = {0};
if (p.p_w != p.p_h) {
int d_w, d_h;
mp_image_params_get_dsize(&p, &d_w, &d_h);
snprintf(extra, sizeof(extra), " => %dx%d", d_w, d_h);
}
MP_INFO(mpctx, "VO: [%s] %dx%d%s %s\n",
info->name, p.w, p.h, extra, vo_format_name(p.imgfmt));
MP_VERBOSE(mpctx, "VO: Description: %s\n", info->description);
int vo_r = vo_reconfig(vo, &p);
if (vo_r < 0) {
mpctx->error_playing = MPV_ERROR_VO_INIT_FAILED;
goto error;
}
init_vo(mpctx);
}
mpctx->time_frame -= get_relative_time(mpctx);
update_avsync_before_frame(mpctx);
if (!update_subtitles(mpctx, mpctx->next_frames[0]->pts)) {
MP_VERBOSE(mpctx, "Video frame delayed due waiting on subtitles.\n");
return;
}
double time_frame = MPMAX(mpctx->time_frame, -1);
int64_t pts = mp_time_us() + (int64_t)(time_frame * 1e6);
// wait until VO wakes us up to get more frames
// (NB: in theory, the 1st frame after display sync mode change uses the
// wrong waiting mode)
if (!vo_is_ready_for_frame(vo, mpctx->display_sync_active ? -1 : pts)) {
if (video_feed_async_filter(mpctx) < 0)
goto error;
return;
}
assert(mpctx->num_next_frames >= 1);
if (mpctx->num_past_frames >= MAX_NUM_VO_PTS)
mpctx->num_past_frames--;
MP_TARRAY_INSERT_AT(mpctx, mpctx->past_frames, mpctx->num_past_frames, 0,
(struct frame_info){0});
mpctx->past_frames[0] = (struct frame_info){
.pts = mpctx->next_frames[0]->pts,
.num_vsyncs = -1,
};
calculate_frame_duration(mpctx);
struct vo_frame dummy = {
.pts = pts,
.duration = -1,
.still = mpctx->step_frames > 0,
.num_frames = mpctx->num_next_frames,
.num_vsyncs = 1,
};
for (int n = 0; n < dummy.num_frames; n++)
dummy.frames[n] = mpctx->next_frames[n];
struct vo_frame *frame = vo_frame_ref(&dummy);
double diff = mpctx->past_frames[0].approx_duration;
if (opts->untimed || vo->driver->untimed)
diff = -1; // disable frame dropping and aspects of frame timing
if (diff >= 0) {
// expected A/V sync correction is ignored
diff /= mpctx->video_speed;
if (mpctx->time_frame < 0)
diff += mpctx->time_frame;
frame->duration = MPCLAMP(diff, 0, 10) * 1e6;
}
mpctx->video_pts = mpctx->next_frames[0]->pts;
mpctx->last_vo_pts = mpctx->video_pts;
mpctx->playback_pts = mpctx->video_pts;
shift_frames(mpctx);
schedule_frame(mpctx, frame);
mpctx->osd_force_update = true;
update_osd_msg(mpctx);
vo_queue_frame(vo, frame);
// The frames were shifted down; "initialize" the new first entry.
if (mpctx->num_next_frames >= 1)
handle_new_frame(mpctx);
mpctx->shown_vframes++;
if (mpctx->video_status < STATUS_PLAYING) {
mpctx->video_status = STATUS_READY;
// After a seek, make sure to wait until the first frame is visible.
vo_wait_frame(vo);
MP_VERBOSE(mpctx, "first video frame after restart shown\n");
}
screenshot_flip(mpctx);
mp_notify(mpctx, MPV_EVENT_TICK, NULL);
if (!mpctx->sync_audio_to_video)
mpctx->video_status = STATUS_EOF;
if (mpctx->video_status != STATUS_EOF) {
if (mpctx->step_frames > 0) {
mpctx->step_frames--;
if (!mpctx->step_frames && !opts->pause)
pause_player(mpctx);
}
if (mpctx->max_frames == 0 && !mpctx->stop_play)
mpctx->stop_play = AT_END_OF_FILE;
if (mpctx->max_frames > 0)
mpctx->max_frames--;
}
mpctx->sleeptime = 0;
return;
error:
MP_FATAL(mpctx, "Could not initialize video chain.\n");
uninit_video_chain(mpctx);
error_on_track(mpctx, mpctx->current_track[STREAM_VIDEO][0]);
handle_force_window(mpctx, true);
mpctx->sleeptime = 0;
}
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